Emil hanisoh and max soheoedeb



(No-Model.)

E. HANISGH & M SCI-IROEDER.

PROCESS OF OBTAINING SULPHUROUS ACID. No. 376,883! Patented Jan. 24,1888.

i! w M I/Vl/E/VTORS 3 8 Q ATTORNEYS;

u. PETERS mun-mum. Washington. In:

' UNITED STATES PATENT OFFICE;

EMIL HANISOH AND MAX SOHROEDER, OF HAMBORN, PRUSSIA, GERMANY PROCESS OFOBTAINING SULPHUROUS ACID.

SPECIFICATION forming part of Letters Patent No. 37 83. dated January24, 1888. i I Application filed June 4, 1885. Serial No; 167,663. (Nospecimens.)

To all whom it may concern.-

Be it known that we, EMIL Hlimsorr and specification.

Our invention relates to a process for ole-- taining liquid anhydroussulphurous acid from furnace-gasesor similarly-composed gaseousmixtures. I

We carry out our invention in the-follow ing manner, bythe aid ofthe'apparatus shown in the accompanying drawing, reprecold water is keptcontinuously falling. This falling water thoroughly absorbs thesulphurous acid of'the aforesaid'gases. The unabsorbed gases, whichingeneral consist of nitrogen and oxygen, are carried off from the upperpart of the tower I) through the'pipe c. The watery SO solutions(anhydrous sulphurous-acidsolutions) flow continuously through thepipedinto a series of closed lead pans, e, in which,during their passagethrough the same, they are heated to nearly boilingheat. Ihe SO gaseswhiehare evolved in the pans pass through the outlet-pipe f into thecooling-worm g, which is surrounded with cold water. Thence they passthrough the pipeh into the vessel 2', which is charged with'pieces ofchloride of calcium, or is sprinkled with sulphuric acid, in order toeliminate the particles of water still contained in them. 'From thevessel 11 the gases pass to the compressing-pump Z. The Watery contentswhich have flowed through the series of pans e still contain a certainquantity of sulphurous acid and are subjected to further treatment; Theyare conducted from the series of pans through the pipe at to the vesseln, in whichvare arranged lead-wire nets or strainers. Here they receive'the form of fine rain, in an opposite direction to the flow of which astream of Water'steamis at the same time conducted. 'The water-steam issupplied through the pipe 0. TheuSO gases which are evolved in thevessel a are carried off through the pipe p, which lattercommunicateswith the pipefiand take their part in the process performedin the'worm 'g I p and vessel i. The water condensed in giiows backthrough the pipe into the vesseln,

and is discharged with the boiled-out waters through a pipe, q, providedat the bottom of the vessel n. r V

In order to regulate the pressure within the apparatus, the taffeta bag1' is employed. It is connected to the pipe k and receives the excessgases, the motion of the compressingpump lbeing governed according toitsdimensions. The gases compressed in the pump Zpass through the pipesto the cool- I i ing-worm t, and there become liquid. From thecooling-worm 't the said liquid flows into the vessel a, whence it isdrawn off into containers, such as o, for sending away. A

the permanent gases, (oxygen and nitrogen,) provision is made of thepipe w, which is in communication with the vessel u through a valve, bywhich means the said permanent gases are conducted into theabsorbingtower b.

What we claim as ourinvention, and desire sists of the followingsuccessive steps: first, passing the furnace or other gases through aspray of water for separating the sulphurousacidgases by absorption,secondly, heating the resulting solution'of sulphurous acid and water,so as to evaporate the sulphurous-acid gas therefromythirdly,cooling'the separated gases, and, fourthly, converting the. same intoliquid form bYCOlIlPIQS SlOH and condensation, substantially as setforth.

IOO

In testimony whereof we sign this specifica 'tion in' the presence ofnesses.

EMIL HANISGH.

r MAX SQHBOEDER.

Witnesses:

-AUGU'sT GRILLO,

, JULIUs GRILLO.

two subscribing wit- A 8o In order to be able to occasionally blow off i

